Balanced ionic equation for lead nitrate and potassium chloride

Which of these conditions most likely produces an unstable isotope?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Geothermal energy for industrial use is available almost anywhere. a. true b. false